Review

Within a column the masses of the elements ___________ from top to bottom

• increases
• decreases
• there is no change
• is completely random

A ___________ is an arrangement of elements in columns

• columns
• rows
• periodic table
• electron shell

In the modern periodic table elements are arranged by:

• atomic mass
• atomic number
• valence electrons
• number of isotopes

Each row in the periodic table is called a 

• group
• period
• cluster
• unit

Each column in the periodic table is called a 

• period
• group
• cluster
• unit

_________ are elements that are good conductors of electric current and heat

• noble gasses
• metalloids
• nonmetals
• metals

____________ are elements that form a bridge between the elements on the left and right sides of the periodic table.

• metals
• nonmetals
• metalloids
• transition metals.

Elements that are poor conductors of heat and electricity. Many are gasses at room temperature

• metals
• nonmetals
• metalloids
• transition metals

Elements with properties that fall between those of metals and nonmetals

• transition metals
• noble gasses
• metalloids
• all of the above

which family of metals is most reactive?

• metals in group 3-12

• group 13

• group 1

• group 18